Animals and the veil.

[Peregrinus]

Consider each builds upon the last. This is generalized and simplified, though might provide some illumination.

First density is conscious. It is not conscious awareness or self awareness.

Second density is conscious and awareness (of the illusion). It is not conscious self awareness.

Third density is conscious, awareness, and self awareness.

Fourth density is conscious, awareness, self awareness, and the awareness of the Unity of all things.